User terminal and radio communication method

ABSTRACT

A user terminal according to one aspect of the present disclosure includes: a transmission section that transmits an uplink control channel over multiple slots; and a control section that, when changing an active Bandwidth Part (BWP) during the transmission of the uplink control channel, controls the transmission of the uplink control channel after the BWP changing. According to the one aspect of the present disclosure, it is possible to prevent a communication throughput from lowering even when a BWP is switched.

TECHNICAL FIELD

The present disclosure relates to a user terminal and a radiocommunication method of a next-generation mobile communication system.

BACKGROUND ART

In Universal Mobile Telecommunications System (UMTS) networks, for thepurpose of higher data rates and lower latency, Long Term Evolution(LTE) has been specified (Non-Patent Literature 1). Furthermore, for alarger capacity and higher sophistication than those of LTE (LTE Rel. 8and 9), LTE-Advanced (LTE-A and LTE Rel. 10, 11, 12 and 13) has beenspecified.

LTE successor systems (also referred to as, for example, Future RadioAccess (FRA), the 5th generation mobile communication system (5G), 5G+(plus), New Radio (NR), New radio access (NX), Future generation radioaccess (FX) or LTE Rel. 14, 15 or subsequent releases) have been alsostudied.

According to legacy LTE systems (e.g., LTE Rel. 8 to 13), a userterminal (UE: User Equipment) transmits Uplink Control Information (UCI)by using, for example, a UL control channel (e.g., PUCCH: PhysicalUplink Control Channel).

The UCI may include, for example, retransmission control information(also referred to as HARQ-ACK, ACK/NACK and A/N) for DL data, aScheduling Request (SR) and CSI (e.g., Periodic CSI (P-CSI) or AperiodicCSI (A-CSI)).

CITATION LIST Non-Patent Literature

-   Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 “Evolved. Universal    Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial    Radio Access Network (E-UTRAN); Overall description; Stage 2    (Release 8)”, April 2010.

SUMMARY OF INVENTION Technical Problem

It has been studied for NR to configure one or a plurality of BandWidthParts (BWPs) to a UE per Component Carrier (CC). The BWP may be referredto as a partial frequency band or a partial band.

A plurality of BWPs may be configured to the UE, or the UE may switchbetween these BWPs, and perform transmission/reception processing.Switching of BWPs may be referred to as BWP switching, BWP changing orBWP adaptation.

Furthermore, it has been studied for NR to use a PUCCH over multipleslots. The PUCCH over the multiple slots may be referred to as amulti-slot PUCCH.

It is assumed to apply BWP adaptation during transmission of themulti-slot PUCCH. However, study on resources of the multi-slot PUCCH ina case where BWP adaptation is applied has not advanced. Therefore,unless control is performed to use appropriate PUCCH resources in a casewhere an active BWP is switched, there is a risk that a communicationthroughput and frequency use efficiency deteriorate.

It is therefore one of objects of the present disclosure to provide auser terminal and a radio communication method that can prevent acommunication throughput from lowering even when a BWP is switched.

Solution to Problem

A user terminal according to one aspect of the present disclosureincludes: a transmission section that transmits an uplink controlchannel over multiple slots; and a control section that, when changingan active Bandwidth Part (BWP) during the transmission of the uplinkcontrol channel, controls the transmission of the uplink control channelafter the BWP changing.

Advantageous Effects of Invention

According to one aspect of the present disclosure, it is possible toprevent a communication throughput from lowering even when a BWP isswitched.

BRIEF DESCRIPTION OF DRAWINGS

FIGS. 1A to 1C are diagrams illustrating one example of frequencyhopping of a multi-slot PUCCH.

FIGS. 2A to 2C are diagrams illustrating one example of a frequencyoffset applied to a multi-slot PUCCH.

FIG. 3 is a diagram illustrating one example of a problem that occurs ina multi-slot PUCCH during BWP adaptation.

FIG. 4 is a diagram illustrating another example of the problem thatoccurs in the multi-slot PUCCH during BWP adaptation.

FIGS. 5A and 5B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 1.1.

FIGS. 6A and 6B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 1.2.

FIGS. 7A and 7B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 1.3.

FIG. 8 is a diagram illustrating one example of control of a multi-slotPUCCH during BWP adaptation according to embodiment 1.4.

FIG. 9 is a diagram illustrating one example of an association between Mand a bandwidth of a BWP.

FIGS. 10A and 10B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to a second embodiment.

FIGS. 11A and 11B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 3.1.

FIGS. 12A and 12B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 3.2.

FIGS. 13A and 13B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to a fourth embodiment.

FIGS. 14A and 14B are diagrams illustrating one example of PUCCHresource sets according to a fifth embodiment.

FIGS. 15A to 15C are diagrams illustrating one example of a frequencyoffset according to the fifth embodiment.

FIG. 16 is a diagram illustrating one example of a schematicconfiguration of a radio communication system according to oneembodiment.

FIG. 17 is a diagram illustrating one example of an overallconfiguration of a radio base station according to the one embodiment.

FIG. 18 is a diagram illustrating one example of a functionconfiguration of the radio base station according to the one embodiment.

FIG. 19 is a diagram illustrating one example of an overallconfiguration of a user terminal according to the one embodiment.

FIG. 20 is a diagram illustrating one example of a functionconfiguration of the user terminal according to the one embodiment.

FIG. 21 is a diagram illustrating one example of hardware configurationsof the radio base station and the user terminal according to the oneembodiment.

DESCRIPTION OF EMBODIMENTS

It has been studied for NR to configure one or a plurality of BandwidthParts (BWPs) to a UE per Component Carrier (CC). The BWP may be referredto as a partial frequency band or a partial band.

A BWP used for DL communication may be referred to as a DL BWP, and aBWP used for UL communication may be referred to as a UL BWP, The UE mayassume that one BWP (one DL BWP and one UL BWP) among configured BWPs isactive (available) in a given time. Furthermore, frequency bands of a DLBWP and a UL BWP may overlap each other.

A BWP is assumed to be associated with a specific numerology (such as asub-carrier spacing or a cyclic prefix length), The UE, performsreception in an active DL BWP by using a numerology associated with theDL BWP, and performs transmission in an active UL BWP by using anumerology associated with the UL BWP.

A BWP configuration may include information such as numerologies, afrequency position (e.g., center frequency), a bandwidth (e.g., thenumber of resource blocks (also referred to as RBs or Physical RBs(PRBs)), and time resources (e.g., a slot (mini slot) index or aperiodicity).

The BWP configuration may be notified by, for example, a higher layersignaling. In this regard, the higher layer signaling may be, forexample, one of a Radio Resource Control (RRC) signaling, a MediumAccess Control (MAC) signaling and broadcast information, or acombination of these.

The MAC signaling may use, for example, an MAC Control Element (MAC CE)or an MAC Protocol Data Unit (MAC PDU). The broadcast information maybe, for example, a Master Information Block (MIB), a System InformationBlock (SIB), or Remaining Minimum System Information (RMSI).

The UE may monitor a search space (downlink control channel candidate)or a downlink control channel (e.g., PDCCH) associated with the COntrolREsource SET (CORESET) in at least one of configured DL BWPs (e.g., a DLBWP included in a primary CC).

The CORESET is a control channel (e.g., Physical Downlink ControlChannel (PDCCH)) allocation candidate domain, and may be referred to asa control subband, a search space set, a search space resource set, acontrol domain, a controlling subband and an NR-PDCCH domain.

A plurality of BWPs may be configured to the UE, and the UE may switchbetween these BWPs, and perform transmission/reception processing. As aswitching method, a method for indicating a BWP that is made active(activated) by an MAC signaling and/or DCI, and a method for switchingto a default BWP when a given timer expires have been studied. Switchingof the BWP may be referred to as BWP switching, BWP changing, and BWPadaptation.

By, for example, causing the UE to use a BWP of a wide band when thereis data, and using a BWP of a narrow band for CORESET monitoring whenthere is not data, it is possible to reduce power consumption of the UE.

In addition, the default BWP may be configured to the UE by, forexample, a higher layer signaling, or may be assumed as the same as anactive BWP that is used first (initial active BWP).

Furthermore, it has been studied for NR support a UL control channel(also referred to as a short PUCCH or a shortened PUCCH below) of ashorter duration than those of Physical Uplink Control Channel (PUCCH)formats of legacy LTE systems (e.g., LTE Rel. 8 to 13), and/or a ULcontrol channel (also referred to as a long PUCCH below) of a longerduration than the shorter duration.

As, for example, a short PUCCH format, a PUCCH format 0 whose number ofbits of UCI to convey is 2 or less and whose number of OFDM symbols is1, 2 or 3 bits, and a PUCCH format 2 whose number of bits of UCI toconvey is larger than 2 and whose number of OFDM symbols is 1, 2 or 3bits have been studied.

Furthermore, as a long PUCCH format, a PUCCH format 1 whose number ofbits of UCI to convey is 2 or less and whose number of OFDM symbols is 4to 14 bits, and a PUCCH format 3 whose number of bits of UCI to conveyis larger than 2 and whose number of OFDM symbols is 4 to 14 bits havebeen studied.

In addition, a “PUCCH” simply described in this description may be readas “a long PUCCH and/or a short PUCCH”.

It has been studied for NR to use a PUCCH over multiple slots. The PUCCHover the multiple slots may be referred to as a multi-slot PUCCH.

The same data (UCI) may be transmitted or different data may betransmitted in each slot by the multi-slot PUCCH. When the same data istransmitted, reduction of an error rate of the UCI can be expected. Whenthe different data is transmitted, improvement of a throughput can beexpected.

The multi-slot PUCCH may support intra-slot frequency hopping and/orinter-slot frequency hopping. In addition, it may be assumed that bothof these intra-slot and inter-slot frequency hopping cannot beconcurrently enabled for an identical UE, or it may be assumed thatthese intra-slot and inter-slot frequency hopping can be concurrentlyenabled.

FIGS. 1A to 1C are diagrams illustrating one example of frequencyhopping of a multi-slot PUCCH. FIGS. 1A to 1C each illustrate an exampleof the multi-slot PUCCH over 8 slots. Each of FIGS. 1A to 1C illustratesa Frequency Hopping (FH) boundary.

FIG. 1A illustrates the example where a first hop includes 4 slots (slotindices=1 to 4), and a second hop includes 4 slots (slot indices=5 to8).

FIG. 1B illustrates the example where each hop includes 1 slot. FIG. 1Cillustrates the example where each hop includes 2 slots. A number ofslots M=2 in a case in FIG. 1C) per hop illustrated in FIG. 1C may beconfigured by, for example, a higher layer signaling.

In this regard, the figures related to PUCCH resources in thisdescription suppose that one square represents a resource of 1 PRB and 1slot. However, the present invention is not limited to this. Forexample, a frequency resource associated with one square domain may beone or plurality of subcarriers, subbands, Resource Elements (REs), PRBsor RB groups. Furthermore, a time resource associated with one squaredomain may be one or a plurality of symbols, mini slots, slots orsubframes.

Furthermore, in this description, terms related to frequency resourcessuch as subcarriers, subbands, REs, PRBs and RB groups can be readinterchangeably. In this description, terms related to symbols, minislots, slots and subframes can be read interchangeably.

Information related to a frequency resource of a specific hop may benotified to the UE by using a higher layer signaling. The informationrelated to the frequency resource of the specific hop may include atleast one of, for example, information of a given reference frequencyresource (e.g., a frequency resource of the first hop), and informationof a frequency offset (also referred to simply as a “frequency offset”below) from the reference frequency resource to the frequency resourceof the specific hop.

The information of the frequency offset may be indicated by, forexample, a PRB index. FIGS. 2A to 2C are diagrams illustrating oneexample of frequency offsets to be applied to multi-slot PUCCHs. FIGS.2A to 2C illustrate the same examples as those in FIGS. 1A to 1C, andillustrate PRB index offsets as inter-hop frequency offsets.

By the way, it is assumed that BWP adaptation is applied duringtransmission of a multi-slot PUCCH. However, in this case, when the UEtries to transmit the PUCCH by using the same frequency resource beforeand after BWP changing, situations that some PUCCHs cannot betransmitted, or PUCCH resources divide a band in a BWP occur.

FIG. 3 is a diagram illustrating one example of a problem that occurs ina multi-slot PUCCH during BWP adaptation. In this example, the UEswitches an active BWP from a BWP #1 to a BWP #2 of a relatively narrowbandwidth. On the other hand, PUCCH resources are determined based on aBWP #1 configuration. In this case, a sixth PUCCH resource is locatedoutside a range of the BWP #2, and therefore the UE cannot transmit thesixth PUCCH resource (information that needs to be transmitted by usingthe sixth PUCCH resource).

FIG. 4 is a diagram illustrating another example of a problem thatoccurs in a multi-slot PUCCH during BWP adaptation. In this example, theUE switches an active BWP from the BWP #2 to the BWP #1 of a relativelywide bandwidth. On the other hand, PUCCH resources are determined basedon a BWP #2 configuration. In this case, a sixth PUCCH resource islocated near the center of the BWP #1. Therefore, the sixth PUCCHresource divides the BWP #1, and it is not possible to transmit anothersignal (e.g., PUCCH) by using a wide contiguous band.

When the active BWP is switched as illustrated in FIGS. 3 and 4, unlesscontrol is performed to use appropriate PUCCH resources, there is a riskthat a communication throughput and frequency use efficiencydeteriorate.

Hence, the inventors of this application have conceived a method forappropriately controlling transmission of a multi-slot PUCCH even whenBWP adaptation is applied.

An embodiment according to the present invention will be described indetail below with reference to the drawings, A radio communicationmethod according to each embodiment may be each applied alone or may beapplied in combination.

In addition, this description mainly describes an example where, asillustrated in FIGS. 3 and 4, 4 slots (first to fourth slots) of themulti-slot PUCCH are transmitted before BWP adaptation, and the rest of3 slots (fifth to seventh slots) are transmitted after the BWPadaptation. However, these numbers of slots may be optional numbers ofslots. Furthermore, the multi-slot PUCCH according to each embodimentsupposes a multi-slot PUCCH whose transmission is started before BWPadaptation, and whose transmission is scheduled after the BWPadaptation, too. However, the present invention is not limited to this.

In description of the following embodiments, a “PUCCH” may mean amulti-slot PUCCH.

Furthermore, the following embodiments will be described supposing theBWP #1 as a BWP of a relatively wide bandwidth, and the BWP #2 as a BWPof a relatively narrow bandwidth. As examples of BWP adaptation, a casewhere the BWP adaptation narrows a bandwidth of a BWP (the BWP #1→ theBWP #2), and a case where the BWP adaptation widens a bandwidth of a BWP(the BWP #2→ the BWP #1) will be described in each embodiment. Theformer will be also referred to as a “case 1”, and the latter will bealso referred to as a “case 2” below.

(Radio Communication Method)

First Embodiment

According to the first embodiment, a UE assumes that a frequencyresource for a second or subsequent slot of a multi-slot PUCCH is notderived from a BWP. In other words, the frequency resource for thesecond or subsequent slot of the multi-slot PUCCH is not influenced byBWP adaptation, and is determined based on a BWP in which a first slothas been transmitted.

According to the first embodiment, even when BWP adaptation is applied,the UE continues using values that are used as a reference frequencyresource and a frequency offset in a first BWP. Some embodiments will bedescribed below.

Embodiment 1.1

According to embodiment 1.1, a UE drops PUCCH transmission in a slotafter BWP adaptation. FIGS. 5A and 5B are diagrams illustrating oneexample of control of a multi-slot PUCCH during BWP adaptation accordingto embodiment 1.1. FIG. 5A illustrates a case 1, and FIG. 5B illustratesa case 2.

In a case of embodiment 1.1, in both of the cases 1 and 2, all oftransmission of the multi-slot PUCCH in slots after BWP adaptation isdropped.

According to a configuration of embodiment 1.1, the UE only needs toperform control to drop transmission of the multi-slot PUCCH when BWPadaptation is applied, so that it is possible to suppress an increase ina UE load related to the multi-slot PUCCH.

In addition, in this description, “drop” may be read as “do nottransmit”, “stop transmission” or “interrupt transmission”interchangeably. Furthermore, “drop PUCCH transmission” may be read as“drop a PUCCH” or “drop PUCCH resources” interchangeably.

Embodiment 1.2

According to embodiment 1.2, when BWP adaptation narrows a bandwidth ofan active BWP, a UE drops PUCCH transmission in a slot after the BWPadaptation. FIGS. 6A and 6B are diagrams illustrating one example ofcontrol of a multi-slot PUCCH during BWP adaptation according toembodiment 1.2. FIG. 6A illustrate a case 1, and FIG. 6B illustrates acase 2.

In a case of embodiment 1.2, multi-slot PUCCH transmission in a slotafter BWP adaptation is dropped in the case 1. On the other hand,multi-slot PUCCH transmission in a slot after BWP adaptation is notdropped and the multi-slot PUCCH is transmitted in the case 2.

According to a configuration of embodiment 1.2, it is possible tosuppress an increase in a UE load in the case 1. It is possible tosuitably continue transmission of a PUCCH in the case 2, so that it ispossible to reserve a coverage of the PUCCH.

Embodiment 1.3

According to embodiment 1.3, a UE drops PUCCH transmission correspondingto frequency resources outside a range of a BWP in a slot after BWPadaptation. FIGS. 7A and 7B are diagrams illustrating one example ofcontrol of a multi-slot PUCCH during BWP adaptation according toembodiment 1.3. FIG. 7A illustrates a case 1, and a FIG. 7B illustratesa case 2.

In the example in FIG. 7A, a sixth PUCCH resource is located outside arange of a BWP #2, and therefore the UE drops the sixth PUCCH resource.On the other hand, fifth and seventh PUCCH resources are located in therange of the BWP #2, and therefore the UE transmits these PUCCHresources.

In the example in FIG. 7B, all of the fifth to seventh slots are locatedin the range of a BWP #2, and therefore the UE transmits the fifth toseventh PUCCH resources.

According to a configuration of embodiment 1.3, it is possible totransmit a PUCCH by using resources in a band of a BWP whileappropriately dropping PUCCH transmission in resources that are outsidethe band of the BWP and cannot be used for transmission.

Embodiment 1.4

According to embodiment 1.4, a UE drops PUCCH transmission correspondingto frequency resources of a specific range in a BWP in a slot after BWPadaptation. For example, the specific range may be near a center of theBWP, may be defined as, for example, a range equal to or more than afirst threshold and less than a second threshold, or may be defined as arange within a third threshold from a center frequency of the BWP.

At least one of these thresholds may be defined by a specification, ormay be notified by a higher layer signaling, a physical layer signaling(e.g., Downlink Control Information (DCI)) or a combination of thesesignalings. In addition, a threshold may be expressed by, for example,an absolute value or a relative value of a PRB index.

FIG. 8 is a diagram illustrating one example of control of a multi-slotPUCCH during BWP adaptation according to embodiment 1.4. FIG. 8illustrates a case 2. This example supposes that the specific range isnear the center of the BWP.

In the example in FIG. 8, a sixth PUCCH resource is located near acenter of a BWP #2, and therefore the UE drops the sixth PUCCH resource.On the other hand, fifth and seventh PUCCH resources are located at anedge of the BWP #2, and therefore the UE transmits these PUCCHresources.

According to a configuration of embodiment 1.4, it is possible to dropPUCCH transmission that divides a BWP, and transmit another signal(e.g., PUSCH) by using a wide and contiguous band.

In addition, according to the first embodiment, the UE may use PUCCHresources to drop as resources for transmission of another signal (e.g.,PUSCH).

According to the above-described first embodiment, even when BWPadaptation is applied during transmission of a multi-slot PUCCH, it ispossible to appropriately decide control of (whether or not to drop)PUCCH transmission that uses PUCCH resources based on a first BWP.

Second Embodiment

According to the second embodiment, a UE assumes that a frequencyresource for a second or subsequent slot of a multi-slot PUCCH isderived from a BWP. In other words, the frequency resource for thesecond or subsequent slot of the multi-slot PUCCH is influenced by BWPadaptation, and is determined based on a BWP for actually transmittingthe PUCCH.

The UE determines a value of a frequency offset k from a referencefrequency resource to a frequency resource of a specific hop based onthe BWP. For example, the UE may determine the value of the frequencyoffset k according to k=M*m. In addition, when BWP adaptation is notapplied, the frequency offset may be determined based on the BWP.

In this regard, M may be a value determined based on a parameter relatedto the BWP. For example, M may be a value based on a bandwidth relatedto the BWP, or may be a value based on a numerology (e.g., Sub-CarrierSpacing (SCS)) used for the BWP. In addition, the bandwidth related tothe BWP may be at least one of a cell bandwidth (cell BW), a systembandwidth (system BW), a bandwidth of a BWP configured to the UE (UEBWP), a bandwidth of the UL BWP and a bandwidth of a BWP.

M may be indicated by a higher layer signaling and/or a physical layersignaling, or may be specified in advance per BWP. FIG. 9 is a diagramillustrating one example of an association between NI and a bandwidth ofa BWP. M may be associated with M=1 when the bandwidth of the BWP isless than 10 MHz, M=2 when the bandwidth of the BWP is equal to or morethan 10 MHz and less than 20 MHz, M=4 when the bandwidth of the BWP isequal to or more than 20 MHz and less than 40 MHz, and M=8 when thebandwidth of the BWP is equal to or more than 40 MHz and less than 80MHz.

m may be referred to as, for example, an offset coefficient, may beindicated by a higher layer signaling and/or a physical layer signaling(e.g., DCI), or may be derived by the UE according to a given rule. Forexample, m may be determined based on a UE group, a UE category or aservice type (e.g., enhanced Mobile Broad Band (eMBB), enhanced MachineType Communication (eMTC) or Ultra Reliable and Low LatencyCommunications (URLLC)).

FIGS. 10A and 10B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to the secondembodiment. FIG. 10A illustrates a case 1, and FIG. 10B illustrates acase 2.

In this case, the frequency offset k=M* m is assumed, and m is assumedas a fixed value. As M of the equation, the UE uses, for the BWP #1, M1determined based on a BWP #1, and use, for a BWP #2. M2 determined basedon the BWP #2. The BWPs #1 and #2 have different bandwidths, and M1 andM2 take different values.

In a case of the second embodiment, even in both of the cases 1 and 2,resources of the multi-slot PUCCH in a slot after BWP adaptation arederived so as to be located within a BWP range, so that it is possibleto suitably continue transmitting a PUCCH without causing drop, too.

According to the above-described second embodiment, even when BWPadaptation is applied during transmission of the multi-slot PUCCH, it ispossible to appropriately adjust the PUCCH resources per BWP.

Third Embodiment

According to the third embodiment, a UE assumes that a method (that maybe referred to as an allocation rule or PUCCH resource indexing) forallocating indices related to frequency resources of a multi-slot PUCCHis associated with a given bandwidth. Examples of the allocation methodwhere the allocation method is associated with a bandwidth of a BWP(embodiment 3.1) and is associated with a system bandwidth (embodiment3.2) will be described below.

Embodiment 3.1

According to embodiment 3.1, a UE assumes that indices related tofrequency resources of a multi-slot PUCCH are indexed per BWP (astarting index is determined). In other words, the frequency resources(indices) of the multi-slot PUCCH are influenced by BWP adaptation, andare determined based on a BWP for actually transmitting a PUCCH.

For example, the UE may assume that the indices of the PUCCH resourcesare allocated from one edge of a frequency band of a configured (and/oractive) BWP.

FIGS. 11A and 11B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 3.1. FIG.11A illustrates a case 1, and FIG. 11B illustrates a case 2.

In addition, this example assumes a frequency offset k=M*m as describedin the second embodiment. However, application of embodiment 3.1 is notlimited to this.

In this example, contiguous numbers are allocated to the indices of thePUCCH resources of a BWP #1 such that a PRB at one edge of the frequencyband of the BWP #1 is 0, and a PRB at the other edge is B₁−1. Contiguousnumbers are allocated to the indices of the PUCCH resources of a BWP #2such that a PRB at one edge of the frequency band of the BWP 42 is 0,and a PRB at the other edge is B₂−1.

As illustrated in FIGS. 11A and 11B, when a center frequency of the BWPchanges, a start position of the indices of the PUCCH resources changes.Therefore, a reference frequency resource also fluctuates per BWP.Consequently, according to embodiment 3.1, even when the centerfrequency of the BWP significantly changes before and after BWPadaptation, the UE can determine the PUCCH resources so as to be locatedwithin the BWP range.

Embodiment 3.2

According to embodiment 3.2, a UE assumes that indices related tofrequency resources of a multi-slot PUCCH are indexed without dependingon a BWP. In other words, a position of a reference frequency resourceof the frequency resources of the multi-slot PUCCH is not influenced byBWP adaptation. For example, it may be assumed that the indices relatedto the frequency resources of the multi-slot PUCCH are indexed dependingon a cell BW or a system BW.

FIGS. 12A and 12B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to embodiment 3.2. FIG.12A illustrates a case 1, and FIG. 12B illustrates a case 2.

In addition, this example assumes a frequency offset k=M*m as describedin the second embodiment. However, application of embodiment 3.2 is notlimited to this.

In this example, contiguous numbers are allocated to the indices of thePUCCH resources such that a PRB at one edge of the cell BW is 0, and aPRB at the other edge is B_(Cell)−1.

As illustrated in FIGS. 12A and 12B, even when a center frequency of theBWP changes, a start position of the indices of the PUCCH resources isthe same. Therefore, the reference frequency resource is also the same.Therefore, it is assumed that, when the center frequency of the BWPsignificantly changes before and after BWP adaptation, the PUCCHresources are located outside the BWP range.

In the examples in FIGS. 12A and 12B, a sixth PUCCH resource is locatedoutside a range of an active BWP (BWP #2 or #1). The UE may drop thesixth PUCCH resource outside the range as described in embodiment 1.3.According to embodiment 3.2, the UE can grasp the indices of the PUCCHresources that are common between BWPs, so that it is possible tosuppress an increase in a load of recognition of the PUCCH resourceindices.

According to the above-described third embodiment, even when BWPadaptation is applied during transmission of the multi-slot PUCCH, it ispossible to appropriately decide the PUCCH resources per BWP.

Fourth Embodiment

According to the fourth embodiment, a UE may assume that frequencyresources of a multi-slot PUCCH conform to resources configured inassociation with an active BWP.

In this regard, resources configured in association with the BWP may beresources such as CSI (e.g., CQI) reporting resources or Semi-PersistentScheduling (SPS) resources that are semi-statically configured by usinga higher layer signaling.

When BWP adaptation is applied (when the BWP is changed), the UE mayrecognize that the PUCCH resources in a slot after the BWP adaptationare resources to be configured for the BWP after the adaptation. In thiscase, the UE may drop PUCCH transmission that uses PUCCH resources inthe slot after the BWP adaptation, or may perform PUCCH transmission.

FIGS. 13A and 13B are diagrams illustrating one example of control of amulti-slot PUCCH during BWP adaptation according to the fourth aspect.FIGS. 13A and 13B illustrate a case 1.

In addition, this description has mainly described a case whereinter-slot/intra-slot frequency hopping are enabled. However, theembodiments of this description can be used even in a case wherefrequency hopping is not enabled (for example, FIGS. 13A and 13Bcorrespond to the case where frequency hopping is not enabled).

In this example, PUCCH resources for a BWP 41 and PUCCH resources for aBWP #2 are respectively configured. A plurality of PUCCH resources maybe configured, and one of the PUCCH resources may be selected by DCI.

In the example in FIG. 13A, after BWP adaptation, the UE drops PUCCHtransmission in PUCCH resources after the adaptation. In the example inFIG. 13B, after BWP adaptation, the UE performs PUCCH transmission inthe PUCCH resources after the adaptation.

According to the above-described fourth embodiment, even when BWPadaptation is applied during transmission of the multi-slot PUCCH, it ispossible to appropriately decide the PUCCH resources per BWP.

Fifth Embodiment

The fifth embodiment will describe in detail a signaling in a case wherefrequency hopping is enabled for a PUCCH.

A plurality of sets (PUCCH resource sets or parameter sets) eachincluding 1 or more parameters related to resources for a PUCCH (PUCCHresources) may be configured (or notified from a radio base station) inadvance to a UE.

One of a plurality of these PUCCH resource sets is indicated by using agiven field in Downlink Control Information (DCI). The UE controlstransmission of the PUCCH based on the PUCCH resource set indicated bythe given field value in the DCI.

When inter-slot frequency hopping is enabled for the PUCCH, each PUCCHresource set configured by a higher layer signaling may includefrequency resource information described in, for example, the firstembodiment.

FIGS. 14A and 14B are diagrams illustrating one example of PUCCHresource sets according to the fifth embodiment. As illustrated in FIG.14A, each value of a given field of DCI indicates a PUCCH resource set.In, for example, FIG. 14A, the given field values “00”, “01” “10” and“11” may indicate PUCCH resource sets #0, #1, #2 and #3, respectively.

As illustrated in FIG. 14B, each PUCCH resource set may include at leastone of following parameters.

-   Information indicating a starting symbol of a PUCCH-   Information indicating the number of symbols of the PUCCH in a slot-   Information (e.g., a starting PRB index) for identifying a frequency    resource (e.g., starting PRB) of a first hop of the PUCCH-   Information indicating the number of resource units (e.g., the    number of PRBs) that compose the frequency resources of the PUCCH-   Information indicating whether frequency hopping is enabled or is    not enabled (turned on or turned off)-   Information related to frequency resources of second and subsequent    hops in a case where frequency hopping is enabled (e.g., information    indicating at least one of above-described k, M and m, and    information indicating indices of respective frequency resources of    the second and subsequent hops)-   Information (frequency hopping mode) indicating a frequency hopping    type (intra-slot and/or inter-slot) to be enabled.

In this regard, at least one parameter illustrated in FIG. 14B may notbe dynamically indicated as a PUCCH resource set, and may besemi-statically configured by a higher layer signaling.

The PUCCH resource set may be configured differently per UCI type(HARQ-ACK, CSI or an SR). For example, a PUCCH resource set for CSI(CQI) may be assumed as a PUCCH resource set to which at least oneparameter is separately configured among PUCCH resource sets forHARQ-ACK.

FIGS. 15A to 15C are diagrams illustrating one example of frequencyoffsets according to the fifth embodiment. In this example, an index #n(e.g., minimum index) of a given resource unit (e.g., PRB/RE) of thefrequency resource of the first hop is notified to the UE.

When the frequency resource of the PUCCH is hopped per slot asillustrated in FIG. 15A, frequency offset information indicating afrequency offset k from a frequency resource of a previous hop (previousslot) may be notified as information related to frequency resources ofsecond and subsequent hops to the UE.

In FIG. 15A, based on an addition (or subtraction) result of an index #nof the frequency resource of the previous hop (e.g., the frequencyresource of the first slot (slot #0)), and the frequency offset k, theUE may determine an index #n+k (or #n−k) of a frequency resource of anext slot (e.g., the frequency resource of the second hop (slot #1)).

In FIG. 15B, frequency offset information indicating a frequency offsetk_(i) of an ith (i=2 to 4) hop from an index #m of a reference frequencyresource is notified the LIE, Information indicating the index #m may benotified (configured) by a higher layer signaling.

in FIG. 15B, the UE may determine an index #m+k_(i) of the frequencyresource of the ith hop based on #m and K_(i).

In FIG. 15C, the frequency offset information indicating the frequencyoffset k of the ith (i=2 to 4) from an index #1 of an edge of a BWP isnotified to the UE. The index #1 may be an index (e.g., the PRB index orthe RE index) of an edge of the BWP on a side opposite to a side towhich the frequency resource of the first hop belongs.

In FIG. 15C, the UE may determine an index #1+k_(i) of the frequencyresource of the ith hop based on #1 and k_(i).

A bandwidth in a case where hopping is enabled will be described below.In addition, a “total bandwidth” and/or a “bandwidth” in the followingdescription can be read as a “frequency offset” described above.

When inter-slot hopping is enabled for a multi-slot PUCCH, a totalbandwidth of all hops and/or a bandwidth of 1 hop may be notified as abandwidth of inter-slot hopping to a UE by a higher layer signaling.

When inter-slot hopping is enabled for the multi-slot PUCCH, the UE mayderive a bandwidth of inter-slot hopping from the bandwidth ofintra-slot hopping. For example, a bandwidth of inter-slot hopping=M*abandwidth of intra-slot hopping, or the bandwidth of inter-slothopping=M*m*the bandwidth of intra-slot hopping may hold. (M and m takevalues described in the second embodiment). In addition, M=1 may beassumed.

The bandwidth of intra-slot hopping may be calculated based on at leastone of bandwidths related to a BWP described in the second embodiment,or may be notified by a higher layer signaling, a physical layersignaling or a combination of these signalings.

A subband of frequency hopping may be configured by a higher layersignaling, or may be an integral multiple of an RBG of a UE BWP or acell BW. Even when intra-slot hopping is configured to be enabled, ifthe numbers of available symbols in 1 slot is smaller than X (e.g., X=7or X=4), intra-slot hopping may be interpreted as disabled (or may beignored).

(Radio Communication System)

The configuration of the radio communication system according to oneembodiment of the present disclosure will be described below. This radiocommunication system uses one or a combination of the radiocommunication method according to each of the above embodiments of thepresent disclosure to perform communication.

FIG. 16 is a diagram illustrating one example of a schematicconfiguration of the radio communication system according to the oneembodiment. A radio communication system 1 can apply Carrier Aggregation(CA) and/or Dual Connectivity (DC) that aggregate a plurality of basefrequency blocks (component carriers) whose 1 unit is a system bandwidth(e.g., 20 MHz) of the LTE system.

In this regard, the radio communication system 1 may be referred to asLong Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B),SUPER 3G, MIT-Advanced, the 4th generation mobile communication system(4G), the 5th generation mobile communication system (5G), New Radio(NR), Future Radio Access (FRA) and the New Radio Access Technology(New-RAT), or a system that realizes these techniques.

The radio communication system 1 includes a radio base station 11 thatforms a macro cell C1 of a relatively wide coverage, and radio basestations 12 (12 a to 12 c) that are located in the macro cell C1 andform small cells C2 narrower than the macro cell C1. Furthermore, a userterminal 20 is located in the macro cell C1 and each small cell C2. Anarrangement and the numbers of respective cells and the user terminals20 are not limited to the aspect illustrated in FIG. 16.

The user terminal 20 can connect with both of the radio base station 11and the radio base stations 12. The user terminal 20 is assumed toconcurrently use the macro cell C1 and the small cells C2 by using CA orDC. Furthermore, the user terminal 20 can apply CA or DC by using aplurality of cells (CCs).

The user terminal 20 and the radio base station 11 can communicate byusing a carrier (also referred to as a legacy carrier) of a narrowbandwidth in a relatively low frequency band (e.g., 2 GHz). On the otherhand, the user terminal 20 and each radio base station 12 may use acarrier of a wide bandwidth in a relatively high frequency band (e.g.,3.5 GHz or 5 GHz) or may use the same carrier as that used between theuser terminal 20 and the radio base station 11. In this regard, aconfiguration of the frequency band used by each radio base station isnot limited to this.

Furthermore, the user terminal 20 can perform communication by usingTime Division Duplex (TDD) and/or Frequency Division Duplex (FDD) ineach cell. Furthermore, each cell (carrier) may be applied a singlenumerology or may be applied a plurality of different numerologies.

The numerology may be a communication parameter to be applied totransmission and/or reception of a certain signal and/or channel, andmay indicate at least one of, for example, a sub-carrier spacing, abandwidth, a symbol length, a cyclic prefix length, a subframe length, aTTI length, the number of symbols per TTI, a radio frame configuration,specific filtering processing performed by a transceiver in afrequency-domain, and specific windowing processing performed by thetransceiver in a time-domain. For example, a case where sub-carrierspacings of constituent OFDM symbols are different and/or a case wherethe numbers of OFDM symbols are different on a certain physical channelmay be read as that numerologies are different.

The radio base station 11 and each radio base station 12 (or the tworadio base stations 12) may be connected by way of wired connection(e.g., optical fibers compliant with a Common Public Radio interface(CPRI) or an X2 interface) or radio connection.

The radio base station 11 and each radio base station 12 are eachconnected with a higher station apparatus 30 and connected with a corenetwork 40 via the higher station apparatus 30. In this regard, thehigher station apparatus 30 includes, for example, an access gatewayapparatus, a Radio Network Controller (RNC) and a Mobility ManagementEntity (MME), yet is not limited to these. Furthermore, each radio basestation 12 may be connected with the higher station apparatus 30 via theradio base station 11.

In this regard, the radio base station 11 is a radio base station thathas a relatively wide coverage, and may be referred to as a macro basestation, an aggregate node, an eNodeB (eNB) or a transmission/receptionpoint. Furthermore, each radio base station 12 is a radio base stationthat has a local coverage, and may be referred to as a small basestation, a micro base station, a pica base station, a femto basestation, a Home eNodeB (HeNB), a Remote Radio Head (RRH) or atransmission/reception point. The radio base stations 11 and 12 will becollectively referred to as a radio base station 10 below when notdistinguished.

Each user terminal 20 is a terminal that supports various communicationschemes such as LTE and LTE-A, and may include not only a mobilecommunication terminal (mobile station) but also a fixed communicationterminal (fixed station).

The radio communication system 1 applies Orthogonal Frequency-DivisionMultiple Access (OFDMA) to downlink and applies Single Carrier-FrequencyDivision Multiple Access (SC-FDMA) and/or OFDMA to uplink as radioaccess schemes.

OFDMA is a multicarrier transmission scheme that divides a frequencyband into a plurality of narrow frequency bands (subcarriers) and mapsdata on each subcarrier to perform communication. SC-FDMA is a singlecarrier transmission scheme that divides a system bandwidth into bandsincluding one or contiguous resource blocks per terminal and causes aplurality of terminals to use respectively different bands to reduce aninter-terminal interference. In this regard, uplink and downlink radioaccess schemes are not limited to a combination of these schemes, andother radio access schemes may be used.

The radio communication system 1 uses a downlink shared channel (PDSCH:Physical Downlink Shared Channel) shared by each user terminal 20, abroadcast channel (PBCH: Physical Broadcast Channel) and a downlinkL1/L2 control channel as downlink channels. User data, higher layercontrol information and a System Information Block (SIB) are conveyed onthe PDSCH, Furthermore, a Master Information Block (MIB) is conveyed onthe PBCH.

The downlink L1/L2 control channel includes a Physical Downlink ControlChannel (PDCCH), an Enhanced Physical Downlink Control Channel (EPDCCH),a Physical Control Format Indicator Channel (PCFICH), and a PhysicalHybrid-ARQ Indicator Channel (PHICH). Downlink Control Information (DCI)including scheduling information of the PDSCH and/or the PUSCHI isconveyed on the PDCCH.

In addition, the scheduling information may be notified by the DCI. Forexample, DCI for scheduling reception of DL data may be referred to as aDL assignment, and DCI for scheduling transmission of UL data may bereferred to as a UL grant.

The number of OFDM symbols used for the PDCCH is conveyed on the PCFICH.Transmission acknowledgement information (also referred to as, forexample, retransmission control information, HARQ-ACK or ACK/NACK) of aHybrid Automatic Repeat reQuest (HARQ) for the PUSCH is conveyed on thePHICH. The EPDCCH is subjected to frequency division multiplexing withthe PDSCH (downlink shared data channel) and is used to convey DCIsimilar to the PDCCH.

The radio communication system 1 uses an uplink shared channel (PUSCH:Physical Uplink Shared Channel) shared by each user terminal 20, anuplink control channel (PUCCH: Physical Uplink Control Channel), and arandom access channel (PRACH: Physical Random Access Channel) as uplinkchannels. User data and higher layer control information are conveyed onthe PUSCH. Furthermore, downlink radio quality information (CQI: ChannelQuality Indicator), transmission acknowledgement information and aScheduling Request (SR) are conveyed on the PUCCH. A random accesspreamble for establishing connection with a cell is conveyed on thePRACH.

The radio communication system 1 conveys a Cell-specific ReferenceSignal (CRS), a Channel State Information-Reference Signal (CSI-RS), aDeModulation Reference Signal (DMRS) and a Positioning Reference Signal(PRS) as downlink reference signals. Furthermore, the radiocommunication system 1 conveys a Sounding Reference Signal (SRS) and aDeModulation Reference Signal (DMRS) as uplink reference signals. Inthis regard, the DMRS may be referred to as a user terminal-specificreference signal (UE-specific Reference Signal). Furthermore, areference signal to be conveyed is not limited to these.

(Radio Base Station)

FIG. 17 is a diagram illustrating one example of an overallconfiguration of the radio base station according to the one embodiment.The radio base station 10 includes pluralities of transmission/receptionantennas 101, amplifying sections 102 and transmission/receptionsections 103, a baseband signal processing section 104, a callprocessing section 105 and a communication path interface 106. In thisregard, the radio base station 10 only needs to be configured to includeone or more of each of the transmission/reception antennas 101, theamplifying sections 102 and the transmission/reception sections 103.

User data transmitted from the radio base station 10 to the userterminal 20 on downlink is input from the higher station apparatus 30 tothe baseband signal processing section 104 via the communication pathinterface 106.

The baseband signal processing section 104 performs processing of aPacket Data Convergence Protocol (PDCP) layer, segmentation andconcatenation of the user data, transmission processing of a Radio LinkControl (RLC) layer such as RLC retransmission control, Medium AccessControl (MAC) retransmission control (e.g., HARQ transmissionprocessing), and transmission processing such as scheduling,transmission format selection, channel coding, Inverse Fast FourierTransform (IFFT) processing, and preceding processing on the user data,and transfers the user data to each transmission/reception section 103.Furthermore, the baseband signal processing section 104 performstransmission processing such as channel coding and inverse fast Fouriertransform on a downlink control signal, too, and transfers the downlinkcontrol signal to each transmission/reception section 103.

Each transmission/reception section 103 converts a baseband signalprecoded and output per antenna from the baseband signal processingsection 104 into a radio frequency range, and transmits a radiofrequency signal. The radio frequency signal subjected to frequencyconversion by each transmission/reception section 103 is amplified byeach amplifying section 102, and is transmitted from eachtransmission/reception antenna 101. The transmission/reception sections103 can be composed of transmitters/receivers, transmission/receptioncircuits or transmission/reception apparatuses described based on acommon knowledge in a technical field according to the presentdisclosure. In this regard, the transmission/reception sections 103 maybe composed as an integrated transmission/reception section or may becomposed of transmission sections and reception sections.

Meanwhile, each amplifying section 102 amplifies a radio frequencysignal received by each transmission/reception antenna 101 as an uplinksignal. Each transmission/reception section 103 receives the uplinksignal amplified by each amplifying section 102. Eachtransmission/reception section 103 performs frequency conversion on thereceived signal into a baseband signal, and outputs the baseband signalto the baseband signal processing section 104.

The baseband signal processing section 104 performs Fast FourierTransform (FITT) processing, Inverse Discrete Fourier Transform (IDFT)processing, error correcting decoding, MAC retransmission controlreception processing, and reception processing of an RLC layer and aPDCP layer on user data included in the input uplink signal, andtransfers the user data to the higher station apparatus 30 via thecommunication path interface 106. The call processing section 105performs call processing (such as configuration and release) of acommunication channel, state management of the radio base station 10 andradio resource management.

The communication path interface 106 transmits and receives signals toand from the higher station apparatus 30 via a given interface.Furthermore, the communication path interface 106 may transmit andreceive (backhaul signaling) signals to and from the another radio basestation 10 via an inter-base station interface (e.g., optical fiberscompliant with the Common Public Radio Interface (CPRI) or the X2interface).

Each transmission/reception section 103 may receive an uplink controlchannel over multiple slots by using given resources (e.g., PUCCHresources).

Each transmission/reception section 103 may transmit information relatedto the PUCCH resources to the user terminal 20.

FIG. 18 is a diagram illustrating one example of a functionconfiguration of the radio base station according to the one embodimentof the present disclosure. In addition, this example mainly illustratesfunction blocks of characteristic portions according to the presentembodiment, and assumes that the radio base station 10 includes otherfunction blocks, too, that are necessary for radio communication.

The baseband signal processing section 104 includes at least a controlsection (scheduler) 301, a transmission signal generation section 302, amapping section 303, a received signal processing section 304 and ameasurement section 305. In addition, these components only need to beincluded in the radio base station 10, and part or all of the componentsmay not be included in the baseband signal processing section 104.

The control section (scheduler) 301 controls the entire radio basestation 10. The control section 301 can be composed of a controller, acontrol circuit or a control apparatus described based on the commonknowledge in the technical field according to the present disclosure.

The control section 301 controls, for example, signal generation of thetransmission signal generation section 302 and signal allocation of themapping section 303. Furthermore, the control section 301 controlssignal reception processing of the received signal processing section304 and signal measurement of the measurement section 305.

The control section 301 controls scheduling (e.g., resource allocation)of system information, a downlink data signal (e.g., a signal that istransmitted on the PDSCH), and a downlink control signal (e.g., a signalthat is transmitted on the PDCCH and/or the EPDCCH and is, for example,transmission acknowledgement information). Furthermore, the controlsection 301 controls generation of a downlink control signal and adownlink data signal based on a result obtained by deciding whether ornot it is necessary to perform retransmission control on an uplink datasignal.

The control section 301 controls scheduling of synchronization signals(e.g., a Primary Synchronization Signal (PSS)/a SecondarySynchronization Signal (SSS)) and downlink reference signals (e.g., aCRS, a CSI-RS and a DMRS).

The control section 301 controls scheduling of an uplink data signal(e.g., a signal that is transmitted on the PUSCH), an uplink controlsignal (e.g., a signal that is transmitted on the PUCCH and/or the PUSCHand is, for example, transmission acknowledgement information), a randomaccess preamble (e.g., a signal that is transmitted on the PRACH) and anuplink reference signal.

The control section 301 may perform control to receive UCI by using thegiven resources (e.g., PUCCH resources).

The transmission signal generation section 302 generates a downlinksignal (such as a downlink control signal, a downlink data signal or adownlink reference signal) based on an instruction from the controlsection 301, and outputs the downlink signal to the mapping section 303.The transmission signal generation section 302 can be composed of asignal generator, a signal generating circuit or a signal generatingapparatus described based on the common knowledge in the technical fieldaccording to the present disclosure.

The transmission signal generation section 302 generates, for example, aDL assignment for notifying downlink data allocation information, and/ora UL grant for notifying uplink data allocation information based on theinstruction from the control section 301. The DL assignment and the ULgrant are both DCI, and conform to a DCI format. Furthermore, thetransmission signal generation section 302 performs encoding processingand modulation processing on a downlink data signal according to a coderate and a modulation scheme determined based on Channel StateInformation (CSI) from each user terminal 20.

The mapping section 303 maps the downlink signal generated by thetransmission signal generation section 302, on given radio resourcesbased on the instruction from the control section 301, and outputs thedownlink signal to each transmission/reception section 103. The mappingsection 303 can be composed of a mapper, a mapping circuit or a mappingapparatus described based on the common knowledge in the technical fieldaccording to the present disclosure.

The received signal processing section 304 performs reception processing(e.g., demapping, demodulation and decoding) on a received signal inputfrom each transmission/reception section 103. In this regard, thereceived signal is, for example, an uplink signal (such as an uplinkcontrol signal, an uplink data signal or an uplink reference signal)transmitted from the user terminal 20. The received signal processingsection 304 can be composed of a signal processor, a signal processingcircuit or a signal processing apparatus described based on the commonknowledge in the technical field according to the present disclosure.

The received signal processing section 304 outputs information decodedby the reception processing to the control section 301. When, forexample, receiving the PUCCH including HARQ-ACK, the received signalprocessing section 304 outputs the HARQ-ACK to the control section 301.Furthermore, the received signal processing section 304 outputs thereceived signal and/or the signal after the reception processing to themeasurement section 305.

The measurement section 305 performs measurement related to the receivedsignal. The measurement section 305 can be composed of a measurementinstrument, a measurement circuit or a measurement apparatus describedbased on the common knowledge in the technical field according to thepresent disclosure.

For example, the measurement section 305 may perform Radio ResourceManagement (RRM) measurement or Channel State Information (CSI)measurement based on the received signal. The measurement section 305may measure received power (e.g., Reference Signal Received Power(RSRP)), received quality (e.g., Reference Signal Received Quality(RSRQ), a Signal to Interference plus Noise Ratio (SINR) or a Signal toNoise Ratio (SNR)), a signal strength (e.g., a Received Signal StrengthIndicator (RSSI)) or channel information (e.g., CSI). The measurementsection 305 may output a measurement result to the control section 301.

(User Terminal)

FIG. 19 is a diagram illustrating one example of an overallconfiguration of the user terminal according to the one embodiment. Theuser terminal 20 includes pluralities of transmission/reception antennas201, amplifying sections 202 and transmission/reception sections 203, abaseband signal processing section 204 and an application section 205.In this regard, the user terminal 20 only needs to be configured toinclude one or more of each of the transmission/reception antennas 201,the amplifying sections 202 and the transmission/reception sections 203.

Each amplifying section 202 amplifies a radio frequency signal receivedat each transmission/reception antenna 201. Each transmission/receptionsection 203 receives a downlink signal amplified by each amplifyingsection 202. Each transmission/reception section 203 performs frequencyconversion on the received signal into a baseband signal, and outputsthe baseband signal to the baseband signal processing section 204. Thetransmission/reception sections 203 can be composed oftransmitters/receivers, transmission/reception circuits ortransmission/reception apparatuses described based on the commonknowledge in the technical field according to the present disclosure. Inthis regard, the transmission/reception sections 203 may be composed asan integrated transmission/reception section or may be composed oftransmission sections and reception sections.

The baseband signal processing section 204 performs FFT processing,error correcting decoding and retransmission control receptionprocessing on the input baseband signal. The baseband signal processingsection 204 transfers downlink user data to the application section 205.The application section 205 performs processing related to layers higherthan a physical layer and an MAC layer. Furthermore, the baseband signalprocessing section 204 may transfer broadcast information of thedownlink data, too, to the application section 205.

On the other hand, the application section 205 inputs uplink user datato the baseband signal processing section 204. The baseband signalprocessing section 204 performs retransmission control transmissionprocessing (e.g., HARQ transmission processing), channel coding,precoding, Discrete Fourier Transform (DFT) processing and IFFTprocessing on the uplink user data, and transfers the uplink user datato each transmission/reception section 203.

Each transmission/reception section 203 converts the baseband signaloutput from the baseband signal processing section 204 into a radiofrequency range, and transmits a radio frequency signal. The radiofrequency signal subjected to the frequency conversion by eachtransmission/reception section 203 is amplified by each amplifyingsection 202, and is transmitted from each transmission/reception antenna201.

Each transmission/reception section 203 may transmit an uplink controlchannel over multiple slots by using given resources (e.g., PUCCHresources).

Each transmission/reception section 203 may receive information relatedto the PUCCH resources from the radio base station 10.

FIG. 20 is a diagram illustrating one example of a functionconfiguration of the user terminal according to the one embodiment. Inaddition, this example mainly illustrates function blocks ofcharacteristic portions according to the present embodiment, and assumesthat the user terminal 20 includes other function blocks, too, that arenecessary for radio communication.

The baseband signal processing section 204 of the user terminal 20includes at least a control section 401, a transmission signalgeneration section 402, a mapping section 403, a received signalprocessing section 404 and a measurement section 405. In addition, thesecomponents only need to be included in the user terminal 20, and part orall of the components may not be included in the baseband signalprocessing section 204.

The control section 401 controls the entire user terminal 20. Thecontrol section 401 can be composed of a controller, a control circuitor a control apparatus described based on the common knowledge in thetechnical field according to the present disclosure.

The control section 401 controls, for example, signal generation of thetransmission signal generation section 402 and signal allocation of themapping section 403. Furthermore, the control section 401 controlssignal reception processing of the received signal processing section404 and signal measurement of the measurement section 405.

The control section 401 obtains from the received signal processingsection 404 a downlink control signal and a downlink data signaltransmitted from the radio base station 10. The control section 401controls generation of an uplink control signal and/or an uplink datasignal based on a result obtained by deciding whether or not it isnecessary to perform retransmission control on the downlink controlsignal and/or the downlink data signal.

When changing an active Bandwidth Part (BWP) (applying BWP adaptation)during transmission of an uplink control channel (multi-slot PUCCH) overmultiple slots, the control section 401 may control transmission of themulti-slot PUCCH after the BWP changing.

The control section 401 may perform control to drop transmission of theuplink control channel after the BWP changing.

When frequency hopping is enabled for the multi-slot PUCCH, the controlsection 401 may decide a frequency offset of a second hop from afrequency offset of a first hop, based on an active BWP (i.e., apre-change BWP before the BWP changing, and a post-change BWP after theBWP changing).

The control section 401 may decide a start position of multi-slot PUCCHresource indices based on the active BWP. The control section 401 maydecide the multi-slot PUCCH resources based on information (e.g., PUCCHresource set) configured to the active BWP among multi-slot PUCCHconfiguration information (e.g., PUCCH resource set) configured per BWP.

When obtaining from the received signal processing section 404 variouspieces of information notified from the radio base station 10, thecontrol section 401 may update parameters used for control based on thevarious pieces of information.

The transmission signal generation section 402 generates an uplinksignal (such as an uplink control signal, an uplink data signal or anuplink reference signal) based on an instruction from the controlsection 401, and outputs the uplink signal to the mapping section 403.The transmission signal generation section 402 can be composed of asignal generator, a signal generating circuit or a signal generatingapparatus described based on the common knowledge in the technical fieldaccording to the present disclosure.

The transmission signal generation section 402 generates an uplinkcontrol signal related to transmission acknowledgement information andChannel State Information (CSI) based on, for example, the instructionfrom the control section 401. Furthermore, the transmission signalgeneration section 402 generates an uplink data signal based on theinstruction from the control section 401. When, for example, thedownlink control signal notified from the radio base station 10 includesa UL grant, the transmission signal generation section 402 is instructedby the control section 401 to generate an uplink data signal.

The mapping section 403 maps the uplink signal generated by thetransmission signal generation section 402, on radio resources based onthe instruction from the control section 401, and outputs the uplinksignal to each transmission/reception section 203. The mapping section403 can be composed of a mapper, a mapping circuit or a mappingapparatus described based on the common knowledge in the technical fieldaccording to the present disclosure.

The received signal processing section 404 performs reception processing(e.g., demapping, demodulation and decoding) on the received signalinput from each transmission/reception section 203. In this regard, thereceived signal is, for example, a downlink signal (such as a downlinkcontrol signal, a downlink data signal or a downlink reference signal)transmitted from the radio base station 10. The received signalprocessing section 404 can be composed of a signal processor, a signalprocessing circuit or a signal processing apparatus described based onthe common knowledge in the technical field according to the presentdisclosure. Furthermore, the received signal processing section 404 cancompose the reception section according to the present disclosure.

The received signal processing section 404 outputs information decodedby the reception processing to the control section 401. The receivedsignal processing section 404 outputs, for example, broadcastinformation, system information, an RRC signaling and DCI to the controlsection 401. Furthermore, the received signal processing section 404outputs the received signal and/or the signal after the receptionprocessing to the measurement section 405.

The measurement section 405 performs measurement related to the receivedsignal. The measurement section 405 can be composed of a measurementinstrument, a measurement circuit or a measurement apparatus describedbased on the common knowledge in the technical field according to thepresent disclosure.

For example, the measurement section 405 may perform RRM measurement orCSI measurement based on the received signal. The measurement section405 may measure received power (e.g., RSRP), received quality (e.g.,RSRQ, an SINR or an SNR), a signal strength (e.g., RSSI) or channelinformation (e.g., CSI). The measurement section 405 may output ameasurement result to the control section 401.

(Hardware Configuration)

In addition, the block diagrams used to describe the above embodimentsillustrate blocks in function units. These function blocks (components)are realized by an optional combination of hardware and/or software.Furthermore, a method for realizing each function block is not limitedin particular. That is, each function block may be realized by using onephysically and/or logically coupled apparatus or may be realized byusing a plurality of these apparatuses formed by connecting two or morephysically and/or logically separate apparatuses directly and/orindirectly (by using, for example, wired connection and/or radioconnection).

For example, the radio base station and the user terminal according tothe one embodiment of the present disclosure may function as computersthat perform processing of the radio communication method according tothe present disclosure. FIG. 21 is a diagram illustrating one example ofthe hardware configurations of the radio base station and the userterminal according to the one embodiment. The above-described radio basestation 10 and user terminal 20 may be each physically configured as acomputer apparatus that includes a processor 1001, a memory 1002, astorage 1003, a communication apparatus 1004, an input apparatus 1005,an output apparatus 1006 and a bus 1007.

In this regard, a word “apparatus” in the following description can beread as a circuit, a device or a unit. The hardware configurations ofthe radio base station 10 and the user terminal 20 may be configured toinclude one or a plurality of apparatuses illustrated in FIG. 21 or maybe configured without including part of the apparatuses.

For example, FIG. 21 illustrates the only one processor 1001. However,there may be a plurality of processors. Furthermore, processing may beexecuted by 1 processor or processing may be executed by 1 or moreprocessors concurrently or successively or by using another method. Inaddition, the processor 1001 may be implemented by 1 or more chips.

Each function of the radio base station 10 and the user terminal 20 isrealized by, for example, causing hardware such as the processor 1001and the memory 1002 to read given software (program), and therebycausing the processor 1001 to perform an operation, and controlcommunication via the communication apparatus 1004 and control readingand/or writing of data in the memory 1002 and the storage 1003.

The processor 1001 causes, for example, an operating system to operateto control the entire computer. The processor 1001 may be composed of aCentral Processing Unit (CPU) including an interface for a peripheralapparatus, a control apparatus, an operation apparatus and a register.For example, the above-described baseband signal processing section 104(204) and call processing section 105 may be realized by the processor1001.

Furthermore, the processor 1001 reads programs (program codes), asoftware module or data from the storage 1003 and/or the communicationapparatus 1004 out to the memory 1002, and executes various types ofprocessing according to these programs, software module or data. As theprograms, programs that cause the computer to execute at least part ofthe operations described in the above-described embodiments are used.For example, the control section 401 of the user terminal 20 may berealized by a control program that is stored in the memory 1002 andoperates on the processor 1001, and other function blocks may be alsorealized likewise.

The memory 1002 is a computer-readable recording medium, and may becomposed of at least one of, for example, a Read Only Memory (ROM), anErasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), aRandom Access Memory (RAM) and other appropriate storage media. Thememory 1002 may be referred to as a register, a cache or a main memory(main storage apparatus). The memory 1002 can store programs (programcodes) and a software module that can be executed to perform the radiocommunication method according to the one embodiment.

The storage 1003 is a computer-readable recording medium, and may becomposed of at least one of, for example, a flexible disk, a floppy(registered trademark) disk, a magnetooptical disk (e.g., a compact disk(Compact Disc ROM (CD-ROM)), a digital versatile disk and a Blu-ray(registered trademark) disk), a removable disk, a hard disk drive, asmart card, a flash memory device (e.g., a card, a stick or a keydrive), a magnetic stripe, a database, a server and other appropriatestorage media. The storage 1003 may be referred to as an auxiliarystorage apparatus.

The communication apparatus 1004 is hardware (transmission/receptiondevice) that performs communication between computers via wired and/orradio networks, and will be also referred to as, for example, a networkdevice, a network controller, a network card and a communication module.The communication apparatus 1004 may be configured to include a highfrequency switch, a duplexer, a filter and a frequency synthesizer torealize, for example, Frequency Division Duplex (FDD) and/or TimeDivision Duplex (TDD). For example, the above-describedtransmission/reception antennas 101 (201), amplifying sections 102(202), transmission/reception sections 103 (203) and communication pathinterface 106 may be realized by the communication apparatus 1004.

The input apparatus 1005 is an input device (e.g., a keyboard, a mouse,a microphone, a switch, a button or a sensor) that accepts an input froman outside. The output apparatus 1006 is an output device (e.g., adisplay, a speaker or a Light Emitting Diode (LED) lamp) that sends anoutput to the outside. In addition, the input apparatus 1005 and theoutput apparatus 1006 may be an integrated component (e.g., touchpanel).

Furthermore, each apparatus such as the processor 1001 or the memory1002 is connected by the bus 1007 that communicates information. The bus1007 may be composed by using a single bus or may be composed by usingdifferent buses between apparatuses.

Furthermore, the radio base station 10 and the user terminal 20 may beconfigured to include hardware such as a microprocessor, a DigitalSignal Processor (DSP), an Application Specific Integrated Circuit(ASIC), a Programmable Logic Device (PLD) and a Field Programmable GateArray (FPGA). The hardware may be used to realize part or all of eachfunction block. For example, the processor 1001 may be implemented byusing at least one of these types of hardware.

MODIFIED EXAMPLE

In addition, each term that has been described in this descriptionand/or each term that is necessary to understand this description may bereplaced with terms having identical or similar meanings. For example, achannel and/or a symbol may be signals (signalings). Furthermore, asignal may be a message. A reference signal can be also abbreviated asan RS (Reference Signal), or may be also referred to as a pilot or apilot signal depending on standards to be applied. Furthermore, aComponent Carrier (CC) may be referred to as a cell, a frequency carrierand a carrier frequency.

Furthermore, a radio frame may include one or a plurality of durations(frames) in a time-domain. Each of one or a plurality of durations(frames) that composes a radio frame may be referred to as a subframe.Furthermore, the subframe may include one or a plurality of slots in thetime-domain. The subframe may be a fixed time duration (e.g., 1 ms) thatdoes not depend on the numerologies.

Furthermore, the slot may include one or a plurality of symbols(Orthogonal Frequency Division Multiplexing (OFDM) symbols or SingleCarrier-Frequency Division Multiple Access (SC-FDMA) symbols) in thetime-domain. Furthermore, the slot may be a time unit based on thenumerologies. Furthermore, the slot may include a plurality of minislots. Each mini slot may include one or a plurality of symbols in thetime-domain. Furthermore, the mini slot may be referred to as a subslot.

The radio frame, the subframe, the slot, the mini slot and the symboleach indicate a time unit for conveying signals. The other correspondingnames may be used for the radio frame, the subframe, the slot, the minislot and the symbol. For example, 1 subframe may be referred to as aTransmission Time Interval (TTI), a plurality of contiguous subframesmay be referred to as TTIs, or 1 slot or 1 mini slot may be referred toas a TTI. That is, the subframe and/or the TTI may be a subframe (1 ms)according to legacy LTE, may be a duration (e.g., 1 to 13 symbols)shorter than 1 ms or may be a duration longer than 1 ms. In addition, aunit that indicates the TTI may be referred to as a slot or a mini slotinstead of a subframe.

In this regard, the TTI refers to, for example, a minimum time unit ofscheduling for radio communication. For example, in the LTE system, theradio base station performs scheduling for allocating radio resources (afrequency bandwidth or transmission power that can be used in each userterminal) in TTI units to each user terminal. In this regard, adefinition of the TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet(transport block), code block and/or codeword, or may be a processingunit of scheduling or link adaptation. In addition, when the TTI isgiven, a time period (e.g., the number of symbols) in which a transportblock, a code block and/or a codeword are actually mapped may be shorterthan the TTI.

In addition, when 1 slot or 1 mini slot is referred to as a TTI, 1 ormore TTIs (i.e., 1 or more slots or 1 or more mini slots) may be aminimum time unit of scheduling. Furthermore, the number of slots (thenumber of mini slots) that compose a minimum time unit of the schedulingmay be controlled.

The TTI having the time duration of 1 ms may be referred to as a generalTTI (TTIs according to LTE Rel. 8 to 12), a normal TTI, a long TTI, ageneral subframe, a normal subframe or a long subframe. A TTI shorterthan the general TTI may be referred to as a reduced TTI, a short TTI, apartial or fractional TTI, a reduced subframe, a short subframe, a minislot or a subslot.

In addition, the long TTI (e.g., the general TTI or the subframe) may beread as a TTI having a time duration exceeding 1 ms, and the short TTI(e.g., the reduced TTI) may be read as a TTI having a TTI length lessthan the TTI length of the long TTI and equal to or more than 1 ms.

A Resource Block (RB) is a resource allocation unit of the time-domainand the frequency-domain, and may include one or a plurality ofcontiguous subcarriers in the frequency-domain. Furthermore, the RB mayinclude one or a plurality of symbols in the time-domain or may have thelength of 1 slot, 1 mini slot, 1 subframe or 1 TTL 1 TTI or 1 subframemay each include one or a plurality of resource blocks. In this regard,one or a plurality of RBs may be referred to as a Physical ResourceBlock (PRB: Physical RB), a Sub-Carrier Group (SCG), a Resource ElementGroup (REG), a PRB pair or an RB pair.

Furthermore, the resource block may include one or a plurality ofResource Elements (REs). For example, 1 RE may be a radio resourcedomain of 1 subcarrier and 1 symbol.

In this regard, structures of the above-described radio frame, subframe,slot, mini slot and symbol are only exemplary structures. For example,configurations such as the number of subframes included in a radioframe, the number of slots per subframe or radio frame, the number ofmini slots included in a slot, the numbers of symbols and RBs includedin a slot or a mini slot, the number of subcarriers included in an RB,the number of symbols in a TTI, a symbol length and a Cyclic Prefix (CP)length can be variously changed.

Furthermore, the information and parameters described in thisdescription may be expressed by using absolute values, may be expressedby using relative values with respect to given values or may beexpressed by using other corresponding information. For example, a radioresource may be instructed by a given index.

Names used for parameters in this description are in no respectrestrictive names. For example, various channels (the Physical UplinkControl Channel (PUCCH) and the Physical Downlink Control Channel(PDCCH)) and information elements can be identified based on varioussuitable names. Therefore, various names assigned to these variouschannels and information elements are in no respect restrictive names.

The information and the signals described in this description may beexpressed by using one of various different techniques. For example, thedata, the instructions, the commands, the information, the signals, thebits, the symbols and the chips mentioned in the above entiredescription may be expressed as voltages, currents, electromagneticwaves, magnetic fields or magnetic particles, optical fields or photons,or optional combinations of these.

Furthermore, the information and the signals can be output from a higherlayer to a lower layer and/or from the lower layer to the higher layer.The information and the signals may be input and output via a pluralityof network nodes.

The input and output information and signals may be stored in a specificlocation (e.g., memory) or may be managed by using a management table.The information and signals to be input and output can be overwritten,updated or additionally written. The output information and signals maybe deleted. The input information and signals may be transmitted toother apparatuses.

Notification of information is not limited to the aspect/embodimentsdescribed in this description and may be performed by using othermethods. For example, the information may be notified by a physicallayer signaling (e.g., Downlink Control Information (DCI) and UplinkControl Information (UCI)), a higher layer signaling (e.g., a RadioResource Control (RRC) signaling, broadcast information (a MasterInformation Block (MM) and a System Information Block (SIB)), and aMedium Access Control (MAC) signaling), other signals or combinations ofthese.

In addition, the physical layer signaling may be referred to as Layer1/Layer 2 (L1/L2) control information (L1/L2 control signal) or L1control information (L1 control signal). Furthermore, the RRC signalingmay be referred to as an RRC message, and may be, for example, anRRCConnectionSetup message or an RRCConnectionReconfiguration message.Furthermore, the MAC signaling may be notified by using, for example, anMAC Control Element (MAC CE).

Furthermore, notification of given information (e.g., notification of“being X”) is not limited to explicit notification, and may be performedimplicitly (by, for example, not notifying this given information or bynotifying another information).

Decision may be made based on a value (0 or 1) expressed as 1 bit, maybe made based on a boolean expressed as true or false or may be made bycomparing numerical values (by, for example, making comparison with agiven value).

Irrespectively of whether software is referred to as software, firmware,middleware, a microcode or a hardware description language or isreferred to as other names, the software should be widely interpreted tomean a command, a command set, a code, a code segment, a program code, aprogram, a subprogram, a software module, an application, a softwareapplication, a software package, a routine, a subroutine, an object, anexecutable file, an execution thread, a procedure or a function.

Furthermore, software, commands and information may be transmitted andreceived via transmission media. When, for example, the software istransmitted from websites, servers or other remote sources by usingwired techniques (e.g., coaxial cables, optical fiber cables, twistedpairs and Digital Subscriber Lines (DSLs)) and/or radio techniques(e.g., infrared rays and microwaves), these wired techniques and/orradio techniques are included in a definition of the transmission media.

The terms “system” and “network” used in this description are compatiblyused.

In this description, the terms “Base Station (BS)”, “radio basestation”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier” and“component carrier” can be compatibly used. The base station will bealso referred to as a term such as a fixed station, a NodeB, an eNodeB(eNB), an access point, a transmission point, a reception point, afemtocell or a small cell in some cases.

The base station can accommodate one or a plurality of (e.g., three)cells (also referred to as sectors). When the base station accommodatesa plurality of cells, an entire coverage area of the base station can bepartitioned into a plurality of smaller areas. Each smaller area canalso provide communication service via a base station subsystem (e.g.,indoor small base station (RRH: Remote Radio Head)). The term “cell” or“sector” indicates part or the entirety of the coverage area of the basestation and/or the base station subsystem that provide communicationservice in this coverage.

In this description, the terms “Mobile Station (MS)”, “user terminal”,“User Equipment (UE)” and “terminal” can be compatibly used.

The mobile station will be also referred to by a person skilled in theart as a subscriber station, a mobile unit, a subscriber unit, awireless unit, a remote unit, a mobile device, a wireless device, awireless communication device, a remote device, a mobile subscriberstation, an access terminal, a mobile terminal, a wireless terminal, aremote terminal, a handset, a user agent, a mobile client, a client orsome other appropriate terms in some cases.

Furthermore, the radio base station in this description may be read asthe user terminal. For example, each aspect/embodiment of the presentdisclosure may be applied to a configuration where communication betweenthe radio base station and the user terminal is replaced withcommunication between a plurality of user terminals (D2D:Device-to-Device). In this case, the user terminal 20 may be configuredto include the functions of the above-described radio base station 10.Furthermore, words such as “uplink” and “downlink” may be read as a“side”. For example, the uplink channel may be read as a side channel.

Similarly, the user terminal in this description may be read as theradio base station. In this case, the radio base station 10 may beconfigured to include the functions of the above-described user terminal20.

In this description, operations performed by the base station areperformed by an upper node of this base station depending on cases.Obviously, in a network including one or a plurality of network nodesincluding the base stations, various operations performed to communicatewith a terminal can be performed by base stations, one or more networknodes (that are supposed to be, for example, Mobility ManagementEntities (MMES) or Serving-Gateways (S-GWs) yet are not limited tothese) other than the base stations or a combination of these.

Each aspect/embodiment described in this description may be used alone,may be used in combination or may be switched and used when carried out.Furthermore, orders of the processing procedures, the sequences and theflowchart according to each aspect/embodiment described in thisdescription may be rearranged unless contradictions arise. For example,the method described in this description presents various step elementsin an exemplary order and is not limited to the presented specificorder.

Each aspect/embodiment described in this description may be applied toLong Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B),SUPER 3G, IMT-Advanced, the 4th generation mobile communication system(4G), the 5th generation mobile communication system (5G), Future RadioAccess (FRA), the New Radio Access Technology (New-RAT), New Radio (NR),New radio access (NX), Future generation radio access (FX), GlobalSystem for Mobile communications (GSM) (registered trademark), CDMA2000,Ultra Mobile Broadband (LIMB), IEEE 802.11 (Wi-Fi (registeredtrademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20,Ultra-WideBand (UWB), Bluetooth (registered trademark), systems that useother appropriate radio communication methods and/or next-generationsystems that are expanded based on these systems.

The phrase “based on” used in this description does not mean “based onlyon” unless specified otherwise. In other words, the phrase “based on”means both of “based only on” and “based at least on”.

Every reference to elements that use names such as “first” and “second”used in this description does not generally limit the quantity or theorder of these elements. These names can be used in this description asa convenient method for distinguishing between two or more elements.Hence, the reference to the first and second elements does not mean thatonly two elements can be employed or the first element should precedethe second element in some way.

The term “deciding (determining)” used in this description includesdiverse operations in some cases. For example, “deciding (determining)”may be regarded to “decide (determine)” calculating, computing,processing, deriving, investigating, looking up (e.g., looking up in atable, a database or another data structure) and ascertaining.Furthermore, “deciding (determining)” may be regarded to “decide(determine)” receiving (e.g., receiving information), transmitting(e.g., transmitting information), input, output and accessing (e.g.,accessing data in a memory). Furthermore, “deciding (determining)” maybe regarded to “decide (determine)” resolving, selecting, choosing,establishing and comparing. That is, “deciding (determining)” may beregarded to “decide (determine)” some operation.

The words “connected” and “coupled” used in this description or everymodification of these words can mean every direct or indirect connectionor coupling between 2 or more elements, and can include that 1 or moreintermediate elements exist between the two elements “connected” or“coupled” with each other. The elements may be coupled or connectedphysically or logically or by a combination of the physical and logicalconnections. For example, “connection” may be read as “access”.

It can be understood in this description that, when connected, the twoelements are “connected” or “coupled” with each other by using 1 or moreelectric wires, cables and/or printed electrical connection, and byusing electromagnetic energy having wavelengths in radio frequencydomains, microwave domains and/or (both of visible and invisible) lightdomains in some non-restrictive and non-comprehensive examples.

A sentence that “A and B are different” in this description may meanthat “A and B are different from each other”. Words such as “separate”and “coupled” may be also interpreted in a similar manner.

When the words “including” and “comprising” and modifications of thesewords are used in this description or the claims, these words intend tobe comprehensive similar to the word “having”. Furthermore, the word“or” used in this description or the claims intends not to be anexclusive OR.

The invention according to the present disclosure has been described indetail above. However, it is obvious for a person skilled in the artthat the invention according to the present disclosure is not limited tothe embodiments described in this description. The invention accordingto the present disclosure can be carried out as modified and changedaspects without departing from the gist and the scope of the inventiondefined based on the recitation of the claims. Accordingly, thedisclosure of this description is intended for exemplary explanation,and does not bring any restrictive meaning to the invention according tothe present disclosure.

The invention claimed is:
 1. A terminal comprising: a transmissionsection that transmits an uplink control channel over multiple slots;and a control section that, when an active Bandwidth Part (BWP) haschanged after a timer expires, performs a control to not transmit theuplink control channel in frequency resources at positions greater thanor equal to a first threshold and less than or equal to a secondthreshold.
 2. A radio communication method of a terminal comprising:transmitting an uplink control channel over multiple slots; and when anactive Bandwidth Part (BWP) has changed after a timer expires,performing a control to not transmit the uplink control channel infrequency resources at positions greater than or equal to a firstthreshold and less than or equal to a second threshold.
 3. A basestation comprising: a receiving section that receives an uplink controlchannel over multiple slots, wherein, when an active Bandwidth Part(BWP) has changed after a timer expires, the receiving section does notreceive the uplink control channel in frequency resources at positionsgreater than or equal to a first threshold and less than or equal to asecond threshold.
 4. A system comprising a base station and a terminal,wherein: the base station comprises: a receiving section that receivesan uplink control channel over multiple slots, and the terminalcomprises: a transmission section that transmits the uplink controlchannel over multiple slots; and a control section that, when an activeBandwidth Part (BWP) has changed after a timer expires, performs acontrol to not transmit the uplink control channel in frequencyresources at positions greater than or equal to a first threshold andless than or equal to a second threshold.